Solution: Find Pivot Index
Explore how to identify the pivot index in an integer array by tracking cumulative sums. This lesson teaches an efficient linear time approach that calculates running sums to find the index where the sum of elements on the left equals the sum on the right. You will understand the logic behind using total sum and incremental left sums to solve the problem with constant space complexity and one-pass iteration.
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Statement
Given an integer array nums, find the pivot index of the array.
The pivot index is defined as the index where the sum of all elements strictly to its left equals the sum of all elements strictly to its right. If the index lies on the left edge of the array, the left sum is considered
Return the leftmost pivot index. If no such index exists, return
Constraints:
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